Douty washers

[Tamar]

Could I use these on my fuel filter bleed nut? It's says you can use with fuel but it doesn't say which fuel,m

 

[Gibeltarik]

Dowty seals - Yes.

 

[dankilb]

^+1 - they came with our (diesel) filter (facor racor - for what it's worth!) and have been fine for a couple of years since. Lots swear by them and would replace copper washers with them as they go.

 

[Tamar]

I've used the douty seals on my banjo nut and initially for around 3 hours motoring I had no leaks, then checking again when I got back I noticed that they are slightly seeping. I nipped them up again but don't want to strip the thread
What have I done wrong, 14 mm seals.

 

[Poignard]

I dowt whether I could give you an answer.

I'll get my coat...

 

[colhel]

Is the washer clear of the threads on the bango bolt? Are the surfaces of the bolt and filter clean and smooth?

 

[colhel]

Thinking about this further, on a bango bolt there's a lip just below the head then an undercut with a hole. If this lip isn't thick enough, the rubbery bit of the washer won't seal properly. With a copper washer, it won't matter as much.

 

[Tamar]

It's much better than it was. At sea the engine would suddenly lose about 100rpm for a few seconds and sound choked then surge back up to speed. Always when fully loaded with around 10 people. Yesterday it was fine although when I checked the Banjo it was slightly wet

 

[Tamar]

Is the washer clear of the threads on the bango bolt? Are the surfaces of the bolt and filter clean and smooth?

The bottom washer is on the threads I guess

 

[Freebee]

switch to a flat copper washer!! unless the plastic moulded seal is completely covered by the hexagon it wont seal

 

[Assassin]

Dowty washers are designed for hydraulics and high pressures and as such are designed to be crushed slightly to seal them.

For your application I doubt you would get sufficient clamping torque to crush them so I wouls stick to a copper washer and get a pack as they cost very little.

 

[John100156]

It's much better than it was. At sea the engine would suddenly lose about 100rpm for a few seconds and sound choked then surge back up to speed. Always when fully loaded with around 10 people. Yesterday it was fine although when I checked the Banjo it was slightly wet

Whenever I had this it was always a slightly challenged primary filter, but expect you have checked that already. Engine dipped for a few seconds then recovered...

 

[Tamar]

Whenever I had this it was always a slightly challenged primary filter, but expect you have checked that already. Engine dipped for a few seconds then recovered...

Yes I put new filters on. Just can't get a good seal on the Banjo fitting on the secondary fitting.